Iphone phone app keeps crashing?

Okay so umm i messed up a file in the mobilephone.app and i'm wondering if there's a way to get that file back? I have an iphone 4s verizon running 6.1 (10B142). The phone is obviously jailbroken, when ever i try to open the phone app it crashes before it opens. I tried a back up and that didn't work. I tried to restore it to 6.1.2 but it doesn't let me since apple isn't signing it. I'm willing to restore my phone as long as the firmaware doesn't go above 6.1.2. Any suggestions, please i need this quick.

That happenes with alot of apps you should wait for update

Save your shsh, backup, tinyumbrella, and restore. Problem solved

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